Prepare the chickpea base by mashing the chickpeas with tahini and lemon juice.
Spread the chickpea mixture evenly in a serving dish as the first layer.
Layer on the Greek yogurt, smoothing it over the chickpea mixture.
Sprinkle the diced cucumber evenly on top of the yogurt layer.
Add a layer of diced tomatoes, spreading them evenly as well.
Chop the kalamata olives and sprinkle them over the diced tomatoes.
Top with chopped red onion, followed by oregano and feta cheese.
Drizzle with olive oil for an extra touch of richness if desired.
Chill the dip for at least 30 minutes before serving.